Automatic fuel-oil vapor burner



W. F. LA ROSE AUTOMATIC FUEL OIL VAPOR BURNER Filed May 5.

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atbozweq Feb. 22, 1927 W. F. LA ROSE AUTOMATIC FUEL OIL VAPOR BURNER 5 Sheets-Shoot 2 Feb. 22, 1921a w F LA RQSE .8

AUTOMATIC FUEL OIL VAPOR BURNER Filed May 5. 1925 3 Sheets-Sheet 5 gwuentoz Patented Feb. 22, 1927.

UNITED STATES WILLIAM F. LA ROSE, OF ROCHESTER, NEW YORK.

AUTOMATIC FUEL-OIL varon BURNER.

Application filed May 5, 1925; Serial No. 28,155.

This invention relates to liquid fuel burners, and consists of the novel construction and combination of parts hereinafter fully described and claimed, and illustrated in the accompanying drawings, wherein:

Figure 1 is a view partly in elevation and partly in vertical section of a burner embodying my invention,

Figure 2 is a top plan view of the burner,

Figure 3 is a detail sectional view of'tlie vaporizer on an enlarged scale, 3

Figure 4 is a detail top plan view of the fan or rotor of the vaporizer,

Figure 5 is a detail sectional view of the burner on an enlarged scale, and

Figure 6 is a detail top plan View of the burner.

Corresponding and like parts are referred to in the following description, and designated in the several views of the accompanying drawings, by similar reference characters.

The device comprises a draft flue or chamher 1 fully open at its upper end and provided in its base 2 with air inlet openings 3. A conduit 4 in communication with a motor driven fan 5 or other suitable source of air under pressure, extends into the draft flue 1, and connected to the inner end thereof is an elbow 6 which is supported by a stand 7 extending upwardly from the base 2. A mixing tube 8 provided with a venturi 9 is connected at its lower end to the elbow 6 and positioned upon the upper end thereof is a burner 10.

The burner comprises a shallow cylindrical lower member 11 which rests on the upper end of the mixing tube 8 and which is provided with an opening 12 registering with the bore of the mixing tube 8. The burner member 11 is secured in place by an annular flange 13 formed integrally therewith and embracing the upper end of the mixing tube 8. A concavo-convex screen 14 is secured in place over the upper end of the mixing tube 8 with its convex side disposed uppermost by means of the burner member 11. The upper burner member 15 is in the form of a circular plate which is smaller in diameter than the internal diameter of the lower burner member 11 and which is provided with an upwardly offset central portion 16 having a concave lower side and a diameter greater than that of the opening 12. The burner member 15 is supported above the bottom wall of the lower burner member 11 and its edge maintained in inwardly spaced relation to the vertical wall of the lower burner member 11 by means of legs 17 which rest upon said bottom wall in contact with said vertical wall. The burner member 15 is provided with a radial flange 18 which overlies and is spaced from the upper edge of the vertical wall of the burner member 11. I

A tube 19 having its upper end positioned in the lower end of the mixing tube 8 andits lower end extending through and secured to the bottom wall of the elbow 6, con stitutes part of an oil conduit 20 extending from a float chamber 21. A pipe 22 extend ing from an oil storage tank is connected to the float chamber 21 as at 23, and the latter is provided with a drain cook 24.

A nozzle 25 is secured at its lower end to the upper end ofth-e tube 19, and is provided near its upper end with a restricted and axially arranged outlet port 26 and above said port with radially outlet ports 27. A horizontal plate 28 is carried by the 89 nozzle 25 directly below the outlet ports 27 and is provided with air passages 29. A shallow annular flange 30 extends upwardly from the plate 28 and a comparatively deep annular flange 31 extends downwardly from 35 the plate about the nozzle 25. A nipple 32 has threaded connection with the upper end of the nozzle 25 and mounted thereon is a fan or rotor 33. A spreader plate 34 is threaded to the nipple 32 above the fan or rotor 33 and retains the latter in place and carries a needle valve 35 by means of which the size of the outlet port 26 may be regulated and controlled. The fan 33 comprises a hub 36, arms 37 extending radially from the hub, and downwardly extending blades 38 arranged at an angle with respect to the axis of the fan or rotor.

In practice thecfioat chamber 21 is so ar ranged that the normal level of the fuel oil in the tube 19 will be just below the port 26 of the nozzle 25. During the operation of the device the fan 5 will force air through the conduit 1, elbow 6, and into the lower end of the Venturi mixing tube 8. During its passage through the Venturi tube 8 the air will pass about the parts 28, 33 and 34 and through the openings 29 against the blades 38 of the fan or rotor 33 with the result that the rotor 33 will be set in motion and oil drawn up through the port 26 and laterally through the ports 27. The

rotor 33 produces an intimate mixture of the oil and air so that the former is thoroughly vaporized before entering the venturi 9. The vaporized oil and air will be more thoroughly commingled during their passage through the venturi 9 due to the fact that their rate of travel is materially increased by the venturi 9. The combustible mixture thus formed will pass through the screen 1a and out through the lateral side of the burner 10. The construction of the burner 10 is such that the Home is spread over a large area. A pilot 39 is provided for the purpose of igniting the combustible mixture, and while this pilot is shown as a gas pilot it may be of the electrical type. The device is of such construction that it may be controlled by any of the many well known thermostats now on the market. A drain pipe 40 extends from the bottom of the elbow (5 to a trip valve, not shown, in the suppl pipe 22.

From tie foregoing description, taken in connection with the accompanying drawings, the advantages of the construetimi and of the method of operation of the device will be readily apparent to those skilled in the art to which it appertains.

\Vhile I have described the principle 01 operation of the device, together with the structure which I now consider to he the best embodiment thereot, I desire to have it understood that the device shown is merely illustrative, and that such changes may he made when desired as are within the scope of the invention as claimed.

hat is claimed is:-

l. A device of the character set forth, comprising a Venturi mixing tube, piping of which said tube forms a part, a burner associated with one end of the tube, means for supplying air through the pipe to the other end of the tube, a nozzle entering said other end of the tube, a plate secured to the nozzle and located within the tube, said plate having an opening communicating with the nozzle and provided late "ally beyond said opening with air passages, a tan rotatably supported above the plate, and means for supplying liquid to the nozzle.

2. A device of the character set forth, comprising a Venturi mixing tube, piping of which said tube forms a part, a burner associated with one end of the tube, means for supplying air through the pipe to the other end of the tube, a nozzle entering said other end of the tube, a plate located within said other end of the tube and secured to the nozzle, said plate having an opening comn'mnicating with the nozzle and provided with air pasagcs, a spreader supported above said plate, a rotatably mounted tan positioned between the plate and spreader, and means for supplying liquid to the nozzle.

i n testimony whereof I ali'ix my sigi'iature.

IVILLIAM 1*. LA ROSE. 

